HMPE Mooring Line Trial for Scarabeo III

Corbetta, I.; Sloan, Forrest E.

doi:10.4043/13272-ms

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…To provide insight for device developers and operators, a pertinent review of several key aspects is provided in this paper, including performance and durability attributes, classication and testing, in addition to installation and decommissioning considerations. Since the rst use of nylon ropes for towing applications in the 1950s and initial tests of aramid mooring ropes in the 1980s [11], synthetic ropes have been used in a wide range of demanding surface and subsea applications. Adoption of these materials has been driven by favourable cost, physical property and performance attributes and these criteria have become increasingly important for fossil fuel exploration in ultra deepwater (>2000 m).…”

Section: Introductionmentioning

confidence: 99%

Synthetic mooring ropes for marine renewable energy applications

et al. 2015

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Synthetic mooring ropes have a proven track record of use in harsh operating conditions over the past two decades. As one of the main users of ropes for permanent mooring systems, the oil and gas industry has opted for these components because they possess performance characteristics and economies of scale which are in many respects superior to steel components. Given this accrued experience, it is unsurprising that several marine renewable energy (MRE) device developers have utilised synthetic ropes, motivated by the need to specify economical, reliable and durable mooring systems. Whilst these components are potentially an enabling technology for the MRE sector, this is a new eld of application which can feature highly dynamic mooring tensions and consequently existing certication practices may not be directly applicable. Based on the expertise of the authors, this paper provides a state-of-the-art overview of synthetic ropes in the context of MRE mooring systems, including key information about aspects of specication (performance attributes, classication and testing) as well as application (installation, degradation, maintenance, inspection and decommissioning). It is the intention of this review to provide valuable insight for device developers who are considering using ropes in the specication of t for purpose mooring systems.

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Section: Introductionmentioning

confidence: 99%

Synthetic mooring ropes for marine renewable energy applications

et al. 2015

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“…The aramid rope was a 6+1 wire rope construction of Twaron 1000 fibres. The polyester data presented here was generated on a parallel strand construction rope of Diolen 855TN fibres, in a previous study 16,17 . The largest rope was of 745 ton MBL.…”

Section: Methodsmentioning

confidence: 99%

“…Lifetime predictions are currently virtually impossible for these higher performance materials. As a result there have been very few attempts to use materials other than polyester, though two recent MODU applications of HMPE proved very successful 16,17 . Aramids have been used little since the failures reported in a mooring application in the 1980's 1 .…”

Section: Introductionmentioning

confidence: 99%

Synthetic Mooring Lines for Depths to 3000 Meters

et al. 2002

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This paper presents a study of the use of synthetic fibre mooring lines for deep-sea applications. Three materials are considered: polyester, aramid and HMPE. First, results from a test program completed recently are described. These tests on full size ropes, which include novel extensometric methods based on image analysis, have enabled the influence of mean load, load range and loading frequency on stiffness to be determined for the three materials. Ropes up to 750 tons MBL (minimum break load) have been tested. A comprehensive data set of this type has not been available previously. These data are then used in mooring system analyses, to evaluate a number of design cases for the station keeping of exploration and production platforms. This has allowed a better understanding of the domains of application of these different materials and of related issues for design. Materials research needs have also been clarified. The minimum tension criterion for HMPE and aramid fibre ropes is shown to be one of the critical technical parameters that should be further investigated in order to extend the further application of these materials for taut mooring systems design. Attention should also be given to fatigue analysis for the aramid and HMPE lines.

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“…Polyester is a material already established in offshore mooring systems, it can be said that it is the most used in these applications, and studies that address it have excellent references in the literature [10]. High modulus polyethylene (HMPE), however, is a newer material, also more expensive, but it has excellent mechanical performance and there are studies for Mobile Offshore Drilling Unit [11,12].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the torsional effect for yarn break load test of polymeric multifilaments

2022

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Polymeric multifilaments have gained a significant interest in recent decades. In the studies of mechanical characteristics, although there are different types of tests, such as rupture, abrasion, creep, impact and fatigue, it can be said that the main mechanical characterisation is the tensile rupture strength (Yarn Break Load, YBL), which also serves as a parameter for other tests. The objective of this work is to evaluate the results of breaking strength under different torsional conditions in polymeric multifilaments and to determine optimal twists for failures. The test were carried out with the following materials: polyamide, polyester, and high modulus polyethylene (HMPE), and for torsional conditions: 0, 20, 40, 60, 120, 240, and 480 turns per metre. As a result, for these torsion groups, curves were obtained for the three materials that present an optimal point of maximum rupture value, which was also experimentally proven. The twist that optimises the breaking strength of HMPE is 38 turns per metre, 56 turns per metre for polyester, and 95 turns per metre for polyamide. The twist groups that exceed the optimal torsion have a deleterious effect on the material, where the multifilament ceases to be homogeneous and starts to create an excessive "spring effect". The results found differ from the recommendation of the standard that regulates the YBL test, and thus, a relationship is built between groups of optimal torsion and linear density that provides evidence that the increase in linear density causes the optimal torsion for rupture to also increase, while the standard places a condition of 30 turns per metre for linear densities greater than 2200 dtex, and 60 turns per metre for linear densities less than 2200 dtex. In addition to optimal torsion values, this conclusion is paramount, the test procedure makes a general recommendation that does not optimise the breaking strength.

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HMPE Mooring Line Trial for Scarabeo III

Cited by 8 publications

References 5 publications

Synthetic mooring ropes for marine renewable energy applications

Synthetic mooring ropes for marine renewable energy applications

Synthetic Mooring Lines for Depths to 3000 Meters

Experimental study of the torsional effect for yarn break load test of polymeric multifilaments

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